Abstract
The objective of this work was to evaluate grain yield, oil content and nutrient content in leaf of sunflower plants with different dosis of N, P and K fertilization, with focus on biofuel production. A field experiment was conducted in an Ultisol on DDPA/SEAPI Research Center in Viamão, RS, Brazil. Treatments were three combined N, P and K dosis, based on recommended dosis to state of Rio Grande do Sul, using factors: level 0 (without the nutrient), level 1 (recommended dose) and level 2 (two times recommended dose). Six combinations of these dosis were tested: N0P0K0 (without fertilization), N1P1K1, N2P2K2, N2P1K1, N1P2K1 and N1P1K2. There was positive response of grain yield to fertilization, because all combinations of N, P and K dosis tested had higher yield than treatment without fertilization, with highest yield obtained whith recommended fertilization (N1P1K1), double of recommended fertilization (N2P2K2) and double of N dose (N2P1K1). Oil content in grains did not differ among the treatments, but treatments with fertilization had higher oil yield per hectare than treatment without fertilization, which was related to higher grain yield. Only with N there was increase of nutrient leaf content with fertilization, which occurred with the two applied dosis and was correlated with grain yield, indicating a potential of response to higher dosis than currently recommended.
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Claims 6
Claim · model-written summary
All tested NPK fertilizer combinations raised grain yield over no fertilizer.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- N, P and K dosise0
- Outcome
- yielde0
- Direction
- highere0
- Comparator
- treatment without fertilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all combinations of N, P and K dosis tested had higher yield than treatment without fertilization”
t0“sunflower”
Claim · model-written summary
The highest grain yields occurred with N1P1K1, N2P2K2 and N2P1K1.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- N1P1K1e0
- Outcome
- highest yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest yield obtained whith recommended fertilization (N1P1K1), double of recommended fertilization (N2P2K2) and double of N dose (N2P1K1)”
t0“sunflower”
Claim · model-written summary
Grain oil content did not differ among treatments.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- treatmentse0
- Outcome
- Oil content in grainse0
- Direction
- did not differe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oil content in grains did not differ among the treatments”
t0“sunflower”
Claim · model-written summary
Fertilized treatments increased oil yield per hectare over no fertilizer.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- fertilizatione0
- Outcome
- oil yield per hectaree0
- Direction
- highere0
- Comparator
- treatment without fertilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatments with fertilization had higher oil yield per hectare than treatment without fertilization”
t0“sunflower”
Claim · model-written summary
Nitrogen fertilization increased leaf nutrient content at both doses.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Ne0
- Outcome
- nutrient leaf contente0
- Direction
- increasee0
- Qualifier
- two applied dosise0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only with N there was increase of nutrient leaf content with fertilization, which occurred with the two applied dosis”
t0“sunflower”
Claim · model-written summary
Leaf nutrient content correlated with grain yield.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- leafe0
- Outcome
- grain yielde0
- Direction
- correlated withe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nutrient leaf content with fertilization, which occurred with the two applied dosis and was correlated with grain yield”
t0“sunflower”
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